Published on May 22, 2008
Author: slidario
Source: slideshare.net
Cucs plans
Els cucs plans són animals aplanats dorso-ventralment com una cinta. Presenten simetria bilateral i tenen un cervell. 2 Es coneixen unes 25.000 espècies.
La majoria són hermafrodites que habiten: ambients marins, fluvials, terrestres humits.
ambients marins,
fluvials,
terrestres humits.
Moltes de les espècies més difoses són paràsits que necessiten diversos hostes, uns per a l'estat larvari i altres per a l'estat adult.
2
ectoderma endoderma mesoderma tub digestiu sistema nerviós muscles No tenen aparell respiratori, ni circulatori. 3
4 i 5
Nemertea, l’animal més senzill amb un sistema digestiu complert.
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